105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#if !defined(MediaMetadataManager_h__)
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#define MediaMetadataManager_h__
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#include "mozilla/AbstractThread.h"
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#include "mozilla/LinkedList.h"
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#include "nsAutoPtr.h"
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#include "AbstractMediaDecoder.h"
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#include "MediaEventSource.h"
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#include "TimeUnits.h"
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#include "VideoUtils.h"
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namespace mozilla {
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class TimedMetadata;
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typedef MediaEventProducerExc<TimedMetadata> TimedMetadataEventProducer;
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typedef MediaEventSourceExc<TimedMetadata> TimedMetadataEventSource;
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// A struct that contains the metadata of a media, and the time at which those
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// metadata should start to be reported.
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class TimedMetadata : public LinkedListElement<TimedMetadata> {
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public:
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TimedMetadata(const media::TimeUnit& aPublishTime,
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nsAutoPtr<MetadataTags>&& aTags,
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nsAutoPtr<MediaInfo>&& aInfo)
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: mPublishTime(aPublishTime)
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, mTags(Move(aTags))
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, mInfo(Move(aInfo)) {}
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// Define our move constructor because we don't want to move the members of
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// LinkedListElement to change the list.
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TimedMetadata(TimedMetadata&& aOther)
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: mPublishTime(aOther.mPublishTime)
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, mTags(Move(aOther.mTags))
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, mInfo(Move(aOther.mInfo)) {}
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// The time, in microseconds, at which those metadata should be available.
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media::TimeUnit mPublishTime;
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// The metadata. The ownership is transfered to the element when dispatching to
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// the main threads.
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nsAutoPtr<MetadataTags> mTags;
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// The media info, including the info of audio tracks and video tracks.
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// The ownership is transfered to MediaDecoder when dispatching to the
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// main thread.
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nsAutoPtr<MediaInfo> mInfo;
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};
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// This class encapsulate the logic to give the metadata from the reader to
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// the content, at the right time.
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class MediaMetadataManager {
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public:
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~MediaMetadataManager() {
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TimedMetadata* element;
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while((element = mMetadataQueue.popFirst()) != nullptr) {
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delete element;
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}
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}
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// Connect to an event source to receive TimedMetadata events.
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void Connect(TimedMetadataEventSource& aEvent, AbstractThread* aThread) {
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mListener = aEvent.Connect(
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aThread, this, &MediaMetadataManager::OnMetadataQueued);
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}
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// Stop receiving TimedMetadata events.
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void Disconnect() {
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mListener.Disconnect();
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}
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// Return an event source through which we will send TimedMetadata events
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// when playback position reaches the publish time.
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TimedMetadataEventSource& TimedMetadataEvent() {
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return mTimedMetadataEvent;
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}
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void DispatchMetadataIfNeeded(const media::TimeUnit& aCurrentTime) {
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TimedMetadata* metadata = mMetadataQueue.getFirst();
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while (metadata && aCurrentTime >= metadata->mPublishTime) {
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// Our listener will figure out what to do with TimedMetadata.
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mTimedMetadataEvent.Notify(Move(*metadata));
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delete mMetadataQueue.popFirst();
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metadata = mMetadataQueue.getFirst();
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}
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}
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protected:
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void OnMetadataQueued(TimedMetadata&& aMetadata) {
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mMetadataQueue.insertBack(new TimedMetadata(Move(aMetadata)));
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}
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LinkedList<TimedMetadata> mMetadataQueue;
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MediaEventListener mListener;
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TimedMetadataEventProducer mTimedMetadataEvent;
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};
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} // namespace mozilla
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#endif
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